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To an acidified dichromate solution, a p...

To an acidified dichromate solution, a pinch of `Na_(2)O_(2)` is added and shaken. What is observed ?

A

Blue colour

B

Orange colour changing to green

C

Copious evolution of oxygen

D

Bluish-green precipitate

Text Solution

Verified by Experts

The correct Answer is:
A, C
`underset("(orange)")(Cr_(2)O_(7)^(2-)+10H^(+)+4Na_(2)O_(2)rarr`

In the absence of ether or amyl alcohol, `CrO_(5)` in acidic medium decomposes to `Cr^(3+)` with evolution of oxygen.
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ERRORLESS -D & P-BLOCK ELEMENTS-JEE Section (More than one choice correct answer)
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  2. Which of the following is/are soluble in ethanol

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  3. Which of the following halides react(s) with AgNO(3(aq)) to give a pre...

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  4. The correct statement(s) about Cr^(2+) and Mn^(3+) is(are) [Atomic n...

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  5. Fe^(3+) is reduced to Fe^(2+) of NaOH

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  6. Extraction of copper from copper pyrite (CuFeS(2)) involves

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  7. To an acidified dichromate solution, a pinch of Na(2)O(2) is added and...

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  8. Pick out the correct statement(s):

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  9. The species that undergoes disproportionational is an alkaline medium ...

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  10. (NH(4))(2)Cr(2)O(7) on heating gives

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  11. Iron reacts with steam to form

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  12. CuSO(4) reacts with KCN to form

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  13. The slag obtained in extraction of copper pyrites is mainly

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  15. Identify the statement which is correct for copper sulphate

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  16. AgBr used in photography, is removed with the help of ……… called ………. ...

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  17. In solid CuSO(4).5H(2)O

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  18. Which of the following contain five unpaird electrons

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